Prediction of Hydrate Phase Equilibrium of Condensate Gas with High CO2 Content

The phase equilibrium prediction of gas hydrate plays an important role in solving hydrate blockage in oil and gas transmission pipeline and realizing hydrate commercial exploitation. At present, the phase equilibrium prediction of methane hydrate in pure water system is quite perfect. However, there are few studies on the hydrate phase equilibrium of gas mixtures, especially those with high CO2 content. In this paper, based on Chen-Guo model, the hydrate phase equilibrium model is simplified by using the activity in the model measured by water activity meter, so as to achieve the purpose of rapid prediction of hydrate phase equilibrium conditions. In this paper, the phase equilibrium conditions of mixed gas hydrate in KCl, NaCl, HCOONa, HCOOK, MEG and other solutions and mixed solutions are predicted, and verified by hydrate phase equilibrium apparatu.